Year	% of expense
2011	35.77218290778366
2012	35.510356022226986
2013	38.93047890643224
2014	35.479522007337636
2015	45.505630369493964
2016	38.56113268240342
2017	34.200131006531834
2018	34.066991545900905
2019	36.92556593938467
2020	34.74646156796135
2021	26.22327765872222
2022	26.826626086958093